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Which enzyme reduces atmospheric nitrogen to ammonia inside a root nodule?
ANitrogenase enzyme
BNitrate reductase
CCarbonic anhydrase
DRibonuclease enzyme
Answer & Solution
Correct answer: A. Nitrogenase enzyme
1. Soil bacteria interact with legume roots to form nodules, and fixation takes place inside them.
2. The process entails the reduction of atmospheric nitrogen to ammonia by means of the enzyme nitrogenase.
3. Nitrogenase is therefore the enzyme plants themselves lack.
4. Ribonuclease appears in plants in a quite different setting, the rejection of incompatible pollen tubes.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 31 "Soil and Plant Nutrition", section 31.3 Nutritional Adaptations of Plants_
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